Khera referred to the tweet he made in 2022 after his name was not included in the Rajya Sabha list.
Khera was arrested by the Assam Police on Thursday after an FIR was filed against him over alleged remarks against PM Modi.
Khera has been charged with making derogatory remarks about Prime Minister Narendra Modi at the Haflong Police Station in Assam.
On Sunday, Congress announced 10 candidates for the June 10 Rajya Sabha polls.